Most Helpful Guy
I think you need to get some perspective here. You lived with him for 4 months and now he says he's switched off. This is a small period of time in the lifetime. We try things and some don't work, we get up, dust ourselves down, find out what went wrong and learn from that.
I know it is hard, but this is life and sometimes the recovery and the next period is the best part.
Something was wrong and it is best to understand as much as possible. It does not mean you are a bad person, we are all different. What doesn't kill you makes you stronger.
Don't try to get him back. Keep your dignity and try to move on. I know this is difficult but this is what we all must do. Maybe you will find each other again, maybe not.